Alarm for incubators.



No, 810,931. PATENTBD JAN, 30, 1906.

W. S. FREEMAN. ALARM POR INGUBATORS.

APPLICATION FILED MAY 6, 1905.'

[ 1 L vente?,

UNITED rarest* orrron.

vVVILLRD S. iiRltlitli/iithl, 0F Srl. QLUDfMlNNESOT-A.

No. smeer.

Specification of Letters Patent.

' Patented Jan. 3o, 190e.`

Application filed .Hay 6, i905. Serial No. 259.224.

for its object the provision of a circuit-tioslng apparatus to be usedin eonneetion with the dampenregulating arm usually employed inconnection with the thermostat and so constructed and arranged that theweight on the end of the damper-regulating arin coines in contact withthe oontaetfplates and cioses the circuit between a battery or othersource of electric energy and a bell or other desired alarm. f

The construction and advantages iny invention will be explained detailhereinafter and illustrated in the accompanying drawings, in which-Figure l. is a view show i eubator, a damper-regula improvedcircuit-closer in po. 2, an end View of the damper and my oireuit-oioserin position.

ln the drawings similar characters indicato corresponding partethroughout the several views.

A represents the Atop of an iiicubator-oasying; B, the dampenadjustinglever leruined thereon, having a weight i) one end, and a rodD securedto said lever and to any suit-a 'oie construction or thermostat insideoif' the inouhater.

As sometimes the heat-regulating ineens tail to operate or the lamp thatis used to suppiy the heat burns out or is extinguished, i haveprovided. an alarm to warn the opera tor when the temperature is eithertoo het too ooid to properly operate th neubs n My alarm consists of aneieotrie .ily r bell or other signal E having eleotrieal eonnection witha suitable battery il; invention consists or" a eireuihelo' mounted onthe top of the inoohL consisting of an insulated base t metal uprightsli, secured to said metal contact-pieces l, secured in uprights H bymeans ot sorew-holts d'.

bolt-S J have mounted thereon two nuts, one

oi said nuts (designated K) serving to hold the holt in position on theslotted upright H, while the other nut L, which may be a-wingnut orother handeoperated structure, serves to hold the contact-plate inplace, each oontact-plate being inade L-shaped, with the shorter portioni perforated to receive the bolt J, while the longer portion is madetapered, as shown at i. Two contact-plates I are secured to each uprightH directly opposite one another and the base G so positioned that theweight C is between the plates l, and

when the arm B swings approaches or con-l taots with two of said plates.The Wire M from the positive pole of the battery F is se-l cured to oneupright H, while the wire N is seeured to the other uprightH and isconnected with the alarm E. f

0 represents the conductor from the bell back to the battery F.

lt will be understood from the above dee' scription and an inspection ofthe drawings that when the heating apparatus and regulating meansoperates properly the'weight C does not contact with any of the plates 1but that should anything happen to the heating apparatus, so that thetemperature getseither too hot or too cold, the weight C oontacts withthe two plates near the base or top oif uprights il, thus closing:T thecircuit be#Y battery and alarm E, which will tween the warn the operatorof 'the condition, so that it may be attended to. it will be understoodthat hy properly positioning the plates l the apparatus may ne arrangedto give warning at any il edeterinined degree of .heat or cold andthatdi desired, the uprights l'l may be marked, so that the plates niaybe positioned with approximate exaetness. i, l

Having thus described inyinvention, what i claini .is-

l. temperature'-indicating ala-rin oomthe combination of an incubator, a

pris thermostat contained therein, a damper-oprrtin' lever 'fuierurnedon said incubator, a oht one arni of said lever, a rod @only ul .l leverwiththe thermo# a cird. welosing device secured to said inoubatoreonsistingo tvo slotted uprights positioned on opposite sides of saidbalanoeweight, angular contact-plates secured in said slots above andbelow said weight and adinstable on said uprights, the extended po ionsoi said plates being tapered, an aiai'rii-sigrial, and a normally opencircuit connecting said upright-s and alarm, said IOS tempemtw .lCombmatwu 10d th 1f; a um @nulmeting stmt, a Circuit-dosing rief-j Aincubator? consisrw o' two pinned on opnomiv sd of

